Micro-organisms Topic

As part of our science topic on micro-organisms, we performed a yeast experiment. We put yeast, sugar and warm water in a transparent bottle. After 15-30 minutes, most of the balloons had slightly inflated. Some of the balloons inflated quickly but some didn’t inflate until two hours later. The reason why the balloons inflated was because the yeast fed on the sugar and as the yeast was breathing out, carbon dioxide made the balloon inflate.

By Zoe and partly Samantha (She didn’t help much!)